docs: Revert "docs: add download page for app branch binaries"

[marcnause]

Reverts #3435

Reason: https://github.com/fossasia/pslab-app/actions/runs/30219313633 fails after merging

Summary by Sourcery

Revert automatic generation and publication of the app-branch binary download page, returning to the previous documentation-driven download flow.

Documentation:

• Remove the dedicated development builds download page and direct users to the PSLab Application documentation for platform-specific download links and installation instructions.

Chores:

• Delete CI workflow steps responsible for building and uploading the HTML download index for app-branch artifacts.

[sourcery-ai]

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[sourcery-ai]

Hey - I've left some high level feedback:

• Since this reverts a previously added download-page generation due to workflow failure, consider adding a brief comment near the affected workflow section explaining why it was removed to prevent future reintroductions without addressing the underlying CI issue.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since this reverts a previously added download-page generation due to workflow failure, consider adding a brief comment near the affected workflow section explaining why it was removed to prevent future reintroductions without addressing the underlying CI issue.

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[Copilot]

Pull request overview

This PR reverts the previously introduced “app-branch binaries download page” feature, restoring the prior documentation-driven download flow and removing the CI-generated HTML index that was causing post-merge workflow failures.

Changes:

• Update the root README to point users to the official PSLab Application documentation for downloads/install instructions.
• Remove the dedicated docs/downloads.html development-builds download page.
• Delete the GitHub Actions workflow step that generated and published an index.html download page onto the app branch.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
README.md	Removes the direct “development builds” download-page link and directs users to the canonical documentation.
docs/downloads.html	Deletes the standalone downloads HTML page that listed app-branch artifacts.
.github/workflows/push-event.yml	Removes the workflow logic that generated an HTML download index during artifact publication to the app branch.

[github-actions]

Build Status

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/30220194591/artifacts/8637102009.

Screenshots

Android Screenshots

iPhone Screenshots

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